Follow vs. Like?

I have over 100,000 Facebook followers but never created a professional page with a "Like" button, so I'd prefer not to start from 0 with a "Like me on Facebook widget," is it at all possible to have a "follow me on Facebook" button instead, without ever having to be redirected to Facebook itself? I want as few clicks as possible and I don't want to have to send people to Facebook just to click "follow," then go back to my page. Thanks.

No this is currently not possible. There's no Facebook follow button widget for WordPress.com. You can only have a profile badge but this will redirect people to Facebook, i-e it doesn't have any buttons.
BTW your list followers value nothing when to promote your blog on FB.